Oxygen-19
Properties and data of the isotope 19O.
Oxygen-19 is a radioisotope of the chemical element oxygen, which has 11 neutrons in its atomic nucleus in addition to the element-specific 8 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 19. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of 19O is exclusively for academic purposes and experimental research.
See also: list of Oxygen isotopes.
General data
Name of the isotope:Oxygen-19; O-19Symbol:19O or 198OMass number A:19 (= number of nucleons)Atomic number Z:8 (= number of protons)Neutrons N:11Isotopic mass:19.0035780(28) u (atomic weight of Oxygen-19)Nuclide mass:18.9991894 u (calculated nuclear mass without electrons)Mass excess:3.33289 MeVMass defect:0.154336332 u (per nucleus)Nuclear binding energy:143.76336724 MeV (per nucleus)
7.56649301 MeV (average binding energy per nucleon)Separation energy:SN = 3.9556(26) MeV (first neutron)
SP = 17.069(19) MeV (first proton)Half-life:26.470(6) sDecay constant λ:0.026186142068755 s-1Specific activity α:8.299822953492 × 10+20 Bq g-1
22431953928.358 Ci g-1Spin and parity:
(nuclear angular momentum)5/2+Isobaric spin: 3/2Magnetic dipole moment:μ(μN) = 1.53238(7)Quadrupole moment Q:0.00362(13) barn (100 fm2)Nuclear g-factor:gl = 0.612952Mirror nucleus:Sodium-19Year of discovery:1936
Radioactive Decay
Half-life T½ = 26.470(6) s respectively 2.6470 × 101 seconds s.
Decay mode | Daughter | Probability | Decay energy | Details | γ energy (intensity) |
---|
β- | 19F | 100 % | 4.8203(26) MeV | β-: 1.4425(14) MeV [54.4(12) %] β-: 2.1032(15) MeV [45.4(15) %] | 0.197142(4) MeV [95.9(21) %] 1.356843(8) MeV [50.4(11) %] |
Parent Nuclides
Direct parent isotope is: 19N.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 11) and isobaric (same nucleon number A = 19) with Oxygen-19. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 11 | Isobar A = 19 |
4 | 15Be | |
5 | 16B | 19B |
6 | 17C | 19C |
7 | 18N | 19N |
8 | 19O | 19O |
9 | 20F | 19F |
10 | 21Ne | 19Ne |
11 | 22Na | 19Na |
12 | 23Mg | 19Mg |
13 | 24Al | |
14 | 25Si | |
15 | 26P | |
16 | 27S | |
17 | 28Cl | |
External data and identifiers
Last update: 2024-10-09
Perma link: https://www.chemlin.org/isotope/oxygen-19
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